公开(公告)号：US11028209B2

公开(公告)日：2021-06-08

申请号：US16320646

申请日：2017-07-14

Applicant: Denka Company Limited

Inventor： Tatsuya Nagai ,  Takuya Narutomi ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/58 ,  H01M4/1391 ,  H01M10/0525 ,  C08F261/04 ,  C08L27/16 ,  C08F20/44 ,  C08K3/04

Abstract: [Problem]
To provide a conductive resin composition for electrodes which is excellent in dispersibility and oxidation resistance. To provide: an electrode composition employing the conductive resin composition for electrodes and having a low viscosity; an electrode employing the electrode composition and having a low electrode plate resistance; and a lithium ion battery having a high energy density, high output characteristics and a high cyclability.
[Solution]
A conductive resin composition for electrodes, comprising a dispersant, a conductive agent, and a binding material, wherein: the dispersant comprises a graft copolymer in which a monomer containing acrylonitrile as a main component is grafted onto polyvinyl alcohol; the average degree of polymerization of the polyvinyl alcohol is 300 to 3,000 and the degree of saponification of the same is 90 mol % to 100 mol %; and the polyvinyl alcohol content and the polyacrylonitrile content in the graft copolymer are, respectively, 10 mass % to 40 mass % and 90 mass % to 60 mass %.

公开(公告)号：US10193141B2

公开(公告)日：2019-01-29

申请号：US15121110

申请日：2015-02-24

Applicant: TODA KOGYO CORP. ,  DENKA COMPANY LIMITED

Inventor： Akihisa Kajiyama ,  Teruaki Santoki ,  Daisuke Morita ,  Ryuta Masaki ,  Takahiko Sugihara ,  Tsuyoshi Wakiyama ,  Kazutoshi Matsumoto ,  Akira Yoda ,  Taro Inada ,  Hiroshi Yokota ,  Takashi Kawasaki

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/131 ,  H01M4/136 ,  H01M4/58 ,  H01M10/052 ,  H01M4/02

Abstract: An object of the present invention is to provide a positive electrode mixture capable of conducting stable charging and discharging with a less amount of gasses generated which has an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium. The present invention relates to a positive electrode mixture comprising carbon black having a bulk density of not more than 0.1 g/cm3, a crystallite size of 10 to 40 Å, an iodine adsorption of 1 to 150 mg/g, a volatile content of not more than 0.1% and a metal impurity content of not more than 20 ppm, and a positive electrode active substance having an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium.

公开(公告)号：US11098201B2

公开(公告)日：2021-08-24

申请号：US16327265

申请日：2017-08-08

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Daiki Ikeda ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: C09C1/54 ,  H01B1/04 ,  H01M4/62 ,  C09C1/00 ,  H01B1/24 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/13 ,  H01M10/052

Abstract: An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition.
A carbon black for batteries having: BET specific surface area of 50 to 220 m2/g; a crystallite diameter (La) of 30 to 42 Å; and a number of CO2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50° C. to 1200° C. of measurement temperature) of 8.0×1016 to 15.0×1016 molecules/m2 is excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

公开(公告)号：US20190177551A1

公开(公告)日：2019-06-13

申请号：US16327265

申请日：2017-08-08

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya Nagai ,  Shinichiro Osumi ,  Daiki Ikeda ,  Tetsuya Ito ,  Hiroshi Yokota

IPC: C09C1/54 ,  H01M4/1393 ,  H01M4/133 ,  H01B1/24

Abstract: An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition.A carbon black for batteries having: BET specific surface area of 50 to 220 m2/g; a crystallite diameter (La) of 30 to 42 Å; and a number of CO2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50° C. to 1200° C. of measurement temperature) of 8.0×1016 to 15.0×1016 molecules/m2 is excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

公开(公告)号：US11264616B2

公开(公告)日：2022-03-01

申请号：US16330657

申请日：2017-07-03

Applicant: DENKA COMPANY LIMITED

Inventor： Tatsuya Nagai ,  Yoko Horikoshi ,  Hitoshi Kaneko ,  Hiroshi Yokota

IPC: C01B32/158 ,  H01M4/62 ,  H01M4/66 ,  H01M4/136 ,  H01M4/13 ,  H01M4/505 ,  H01M4/131 ,  H01M4/58 ,  H01M4/525 ,  B82B1/00 ,  H01M4/02

Abstract: Provided is a conductive composition for electrodes, the conductive composition having excellent electrical conductivity and dispersibility. Also provided are: a positive electrode for non-aqueous batteries, the positive electrode using the conductive composition and having low electrode plate resistance and excellent binding properties; and a non-aqueous battery having high energy density, high output characteristics, and high cycle characteristics. The conductive composition for electrodes contains a conductive material, an active material, a binder, and a dispersant, wherein the conductive material contains carbon black and a multi-walled carbon nanotube having a powder resistivity of 0.035 Ω·cm or less as measured under a load of 9.8 MPa, and a median volumetric diameter D50 value, which is as a measure of dispersibility, in the range of 0.3-8 μm The positive electrode which is for non-aqueous batteries and has low electrode plate resistance and excellent binding properties; and the non-aqueous battery having high output characteristics and high cycle characteristics are obtained by using the conductive composition in which the content of the multi-walled carbon nanotube in the conductive material is 3-50 mass %.